EP1685320B1 - Kühlkanalabdeckung für einen einstückigen kolben eines verbrennungsmotors - Google Patents

Kühlkanalabdeckung für einen einstückigen kolben eines verbrennungsmotors Download PDF

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Publication number
EP1685320B1
EP1685320B1 EP04765810A EP04765810A EP1685320B1 EP 1685320 B1 EP1685320 B1 EP 1685320B1 EP 04765810 A EP04765810 A EP 04765810A EP 04765810 A EP04765810 A EP 04765810A EP 1685320 B1 EP1685320 B1 EP 1685320B1
Authority
EP
European Patent Office
Prior art keywords
piston
ring
cooling channel
circumference
piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04765810A
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English (en)
French (fr)
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EP1685320A1 (de
Inventor
Dieter Gabriel
Michael T. Lapp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle GmbH
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Mahle GmbH
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Filing date
Publication date
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1685320A1 publication Critical patent/EP1685320A1/de
Application granted granted Critical
Publication of EP1685320B1 publication Critical patent/EP1685320B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • the invention relates to a cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft.
  • the piston shaft is connected with the piston crown via hubs suspended on the piston crown.
  • a multi-part cooled piston having a cooling channel arranged in the edge region of the piston head is known from German Publication No. DE 40 39 751 A1 , which channel is covered with a sheet-metal ring essentially structured like a cup spring.
  • This sheet-metal ring is structured in one piece and can be easily assembled with the piston only because the piston is structured in two parts. In this connection, it is necessary to assemble the sheet-metal ring with the upper piston part first, before the latter is connected with the lower piston part.
  • the DE 4039754 A1 discloses that between the ring rib and the ring wall of an articulated piston is a ring-shaped hollow chamber, which is enclosed by a plate ring to form a closed cooling oil chamber.
  • the plate ring is divided radially into two halves on its periphery, whereby the edges are bent upwards in pressure and counter pressure directions, locating elastically against one another.
  • pistons are known from German Publication No. DD 252 638 A1 and German Publication No. DE 41 34 530 A1 , in which a wall part that covers the cooling channel that is open to the bottom, and runs around the circumference in ring shape, is structured as an open sheet-metal ring, which rests in a groove against the inside circumference of the piston ring zone, and against the outside circumference of the combustion chamber wall, respectively, taking advantage of its plastic deformation according to the Seeger ring principle, i.e. biased in the radial direction.
  • a multi-part piston having a cooling channel is known from German Patent No. DE 42 08 037 C2 , in which the cooling channel, which is open to the bottom, is covered by means of a biased cup spring, which is divided into at least two parts on its circumference, and rests freely on supports against axially opposite sides, radially on the inside and the outside.
  • one-piece cooling channel pistons having a cooling channel arranged in the edge region of the piston head are known from EP 0 561 871 B1 and EP 0 799 373 B1 , which channel is also closed off with cover rings structured like cup springs, or cover rings structured like cup springs and provided with a collar.
  • cover ring or cup spring must be structured in two parts, in order to be able to be assembled. Furthermore, during assembly, each of the two semi-circular ring halves must be individually introduced into corresponding bearings on the piston crown, in the biased state.
  • This task is accomplished by a one-piece plastic ring, U-shaped in cross-section, which has a ring bottom and an outer shank around the circumference that is molded onto the ring bottom and angled off radially to the outside, and an inner shank around the circumference that is angled off radially to the inside.
  • a film hinge radially deflects the ring shank of the plastic ring formed by the hinge, in its positional plane.
  • the ring has a first radial division having a mouth width and a second radial division, approximately opposite the first division, on the circumference, which does not separate the radially angled outer shank that runs around the circumference, to form the film hinge.
  • the U-shaped ring is preferably made of a thermoplastic plastic such as polyphenylene sulfide (PPS) or a polyimide (PI).
  • PPS polyphenylene sulfide
  • PI polyimide
  • the film hinge is preferably determined by a material thickness of the outer shank.
  • the outer shank is preferably arranged on an outside circumference of the piston crown and is angled off radially to the outside, with reference to a crosswise piston axis, and the inner shank is preferably arranged on the inside circumference of the piston head and is angled off radially to the inside.
  • slits that extend to the ring bottom are made in the outer and inner shanks.
  • the slits are non-uniformly distributed over the circumference of the ring, in order to produce a plurality of shanks having different ridge lengths.
  • the film hinge is preferably arranged in a region between the slits.
  • the slits preferably have a width of 2 to 3 mm and the ridge lengths between the slits are 15 to 20 mm.
  • the first radial division having the mouth width forms a cooling oil inlet or a cooling oil outlet for the cooling channel.
  • FIG. 1 shows a one-piece piston 1 for an internal combustion engine, in a cross-sectional diagram that consists of two halves, the left half representing a cross-section of the piston 1 along a longitudinal axis 2 of the piston, and the right half representing a longitudinal axis of the piston 1 that is offset from the former by 90°.
  • Piston 1 is made of steel and has a piston crown 9 having a piston ring band 7 and a piston head 4 having a combustion space depression 5, whereby the piston shaft 10 is connected with the piston hubs 3 suspended on the piston crown.
  • a closed cooling channel 6 that runs around the circumference in ring shape is arranged in piston crown 9, the radial outer delimitation and radial inner delimitation of which channel are determined by the ring wall molded onto the piston head 4 and by the piston crown region on which piston hubs 3 are suspended.
  • the inside of the cooling channel 6 has a recess 14.2 on the ring wall side and a recess 14.1 on the piston crown side, the wall regions of which result in a conically narrowed shape in the axial direction, towards piston head 4.
  • the incline in each instance, is characterized by the angle between the axial piston axis 2.1 and the slant of the recess wall, which is approximately 30°.
  • the recesses 14.1 and 14.2 are delimited by a step 15.1 and 15.2, in each instance, which also result in a conically narrowed shape in the direction towards piston shaft 10, and whose aforementioned defined angle has a value of approximately 20 to 30°.
  • a ring-shaped recess 11 is provided between piston ring band 7 and piston shaft 10, by means of which assembly for closing off the cooling channel 6 by means of a one-piece plastic ring 8, U-shaped in cross-section, takes place.
  • thermoplastic polymer plastic such as polyphenylene sulfide (PPS), Ryton R4 ® or high-temperature polyimide (PI), such as VESPEL ® from DuPont or AURUM ® from Mitsui Chemicals Inc.
  • PPS polyphenylene sulfide
  • PI high-temperature polyimide
  • VESPEL ® from DuPont
  • AURUM ® from Mitsui Chemicals Inc.
  • U-shaped plastic ring 8 has a radial outer shank 8.1 angled away from its ring bottom 8.3, and a radial inner shank 8.2 angled away from ring bottom 8.3, the shanks being are divided by slits 13 non-uniformly distributed over the circumference, in order to simplify carrying out the assembly, so that shank segments L of different lengths are formed.
  • the slits are made down to the bottom 8.3 of plastic ring 8 and have a slightly V-shaped or U-shaped form and a slit width of 2 to 3 mm.
  • the aforementioned radial slitting takes place distributed over the circumference of the ring, preferably in an angle range between 15 and 25°.
  • outer shank 8.1 is arranged on the outside circumference of the ring bottom 8.3, and angled off radially to the outside with reference to crosswise axis 2.2 of the piston, from the ring bottom 8.3, whereby inner shank 8.2 is angled off radially towards the inside, and is arranged on the inside circumference of the piston bottom 8.3.
  • U-shaped plastic ring 8 is radially divided in such a way that opening 17 with a mouth width M is formed. At 180° opposite to this there is a U-shaped opening 16 having approximately the same width, which extends over the radial center of ring bottom 8.3. Both openings 16 and 17 serve as the oil inlet and oil outlet, respectively, in the assembled state of the ring 8, to supply cooling channel 6 with oil.
  • a so-called film hinge 12 is arranged on the radially outer and center end of opening 16, which hinge is essentially formed by a second radial cut D into the piston head up to the outer shank 8.1, so that radial deflection of the ring shanks 8.4 and 8.5 resulting from the film hinge, in the positional plane E of the plastic ring, as shown by arrows in Figure 8 , is made possible by way of the material thickness of outer shank 8.1.
  • the size of the deflection of the ring shanks is determined by the mechanical strength of the plastic used for ring 8, and can certainly take place all the way to contact of the outside radii of the ring.
  • such a film hinge 12 can also be arranged on the radially inner shank 8.1 of the U-shaped ring 8, whereby in this embodiment, the opening 16 is directed not radially inward, as shown in Figures 8 and 9 , but rather radially outward.
  • Assembly of the ring 8 can take place in a simple manner, in that it is bent up, using the film hinge 12, in such a way that it is introduced into the recess 11, and pushed over the hub region suspended on the piston crown.
  • the ring In this preassembled state, the ring is oriented towards the piston head with its ring bottom 8.3.
  • the ring 8 is subsequently pressed over steps 15.1 and 15.2, so that its outer and inner shanks 8.1 and 8.2 come to rest on recesses 14.1 and 14.2, whereby the faces of the shanks are supported on the steps.
  • the radial deflection of shanks 8.1 and 8.2 is guaranteed by the elasticity of the plastic ring.
  • One or two projections 13.1 that are arranged on the circumference, projecting on the circumference, opposite the outer shank 8.1, and engage in one or two recesses in the cooling channel, not shown, serve to prevent the U-shaped ring from rotating out of place.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (15)

  1. Kühlkanalabdeckung (18) für einen einstückigen Kolben (1) eines Verbrennungsmotors, wobei der Kolben einen geschlossenen Kühlkanal (6) aufweist, der innerhalb der Kolbenkrone (9) auf Höhe eines Kolbenringbereichs umläuft, sowie eine zwischen dem Kolbenringbereich (7) und dem Kolbenschaft (10) angebrachte ringförmige Aussparung (11), und wobei der Kolbenschaft (10) mit den an der Kolbenkrone (9) angehängten Kolbennaben (3) verbunden ist, und wobei die Kühlkanalabdeckung (8) einen einteiligen Ring (8) mit einem Ringboden (8.3) umfasst, sowie einen am Umfang des Rings umlaufenden und in den Ringboden (8.3) vergossenen und radial nach außen abgewinkelten äußeren Schenkel (8.1), sowie eine erste radiale Unterteilung (M) mit einer Öffnungsweite, sowie ein Filmgelenk (12) für die radiale Auslenkung des äußeren Schenkels (8.1) des Rings (8), und wobei das Filmgelenk (12) von einer zweiten radialen Unterteilung (D) gegenüber der ersten Unterteilung (M) am Umfang gebildet wird, und wobei die zweite radiale Unterteilung den am Umfang umlaufenden äußeren Schenkel (8.1) nicht trennt, um das Filmgelenk zu bilden, und wobei die Kühlkanalabdeckung dadurch gekennzeichnet ist,
    - dass der einteilige Ring (8) aus einem Kunststoffmaterial besteht;
    - und dass der besagte Ring einen U-förmigen Querschnitt aufweist, wobei ein um den Umfang des Rings umlaufender innerer Schenkel (8.2) in den Ringboden vergossen und radial zur Innenseite des Kolbens abgewinkelt ist.
  2. Kühlkanalabdeckung nach Anspruch 1, wobei das Filmgelenk (12) durch die Materialstärke des äußeren Schenkels (8.1) bestimmt ist.
  3. Kühlkanalabdeckung nach Anspruch 1, wobei im inneren und im äußeren Schenkel (8.1 und 8.2) bis zum Ringboden (8.3) reichende Schlitze (13) angebracht sind und wobei die besagten Schlitze (13) unregelmäßig über den Umfang des Rings (8) verteilt sind, so dass sie eine Vielzahl von Schenkeln mit unterschiedlicher Schenkellänge (L) bilden.
  4. Kühlkanalabdeckung nach Anspruch 3, wobei das Filmgelenk (12) in einem Bereich zwischen den Schlitzen (13) angebracht ist.
  5. Kühlkanalabdeckung nach Anspruch 3, wobei die Schlitze (13) eine Breite zwischen 2 mm und 3 mm aufweisen und die Schenkellängen (L) zwischen den Schlitzen 15 mm bis 20 mm betragen.
  6. Kühlkanalabdeckung nach Anspruch 1, wobei die erste radiale Unterteilung (M) mit ihrer Öffnungsweite einen Kühlöleinlass (16) oder einen Kühlölauslass (17) für den Kühlkanal (6) bildet.
  7. Kühlkanalabdeckung nach Anspruch 1, wobei der U-förmige Ring (8) aus Polyphenylen-Sulfid (PPS) oder aus einem Polyimid (PI) besteht.
  8. Ein einstückiger Kolben (1) eines Verbrennungsmotors, umfassend:
    - eine Kolbenkrone (9);
    - einen geschlossenen Kühlkanal (6) der innen am Umfang der Kolbenkrone auf Höhe des Kolbenringbereichs (7) umläuft;
    - einen Kolbenschaft (10), der über an die Kolbenkrone angehängte Kolbennaben (3) mit der Kolbenkrone (9) verbunden ist;
    - eine zwischen dem Kolbenringbereich und dem Kolbenschaft (10) angebrachte ringförmige Aussparung (11); und
    - eine Kühlkanalabdeckung, die ihrerseits umfasst: einen einteiligen Ring (8) mit einem Ringboden (8.3), einen am Umfang des Rings umlaufenden und in den Ringboden (8.3) vergossenen und radial nach außen abgewinkelten äußeren Schenkel (8.1), sowie eine erste radiale Unterteilung (M) mit einer Öffnungsweite, sowie ein Filmgelenk (12) für die radiale Auslenkung des äußeren Schenkels (8.1) des Rings (8), und wobei das Filmgelenk (12) von einer zweiten radialen Unterteilung (D) gegenüber der ersten Unterteilung (M) am Umfang gebildet wird, und wobei die zweite radiale Unterteilung den am Umfang umlaufenden äußeren Schenkel (8.1) nicht trennt, um das Filmgelenk zu bilden, und wobei die Kühlkanalabdeckung dadurch gekennzeichnet ist,
    - dass der einteilige Ring (8) aus einem Kunststoffmaterial besteht;
    - und dass der besagte Ring einen U-förmigen Querschnitt aufweist, wobei ein um den Umfang des Rings umlaufender innerer Schenkel (8.2) in den Ringboden vergossen und radial zur Innenseite des Kolbens abgewinkelt ist.
  9. Ein einstückiger Kolben nach Anspruch 8, wobei das Filmgelenk (12) der Kühlkanalabdeckung durch die Materialstärke des äußeren Schenkels (8.1) bestimmt ist.
  10. Ein einstückiger Kolben nach Anspruch 8, wobei der äußere Schenkel (8.1) der Kühlkanalabdeckung an einem äußeren Umfang der Kolbenkrone (9) angebracht und in Bezug zur Kolbennabenachse radial nach außen abgewinkelt ist, und wobei der innere Schenkel (8.2) an einem inneren Umfang des Kolbenbodens (4) angebracht und radial nach innen abgewinkelt ist.
  11. Ein einstückiger Kolben nach Anspruch 10, wobei im inneren und im äußeren Schenkel (8.1 und 8.2) bis zum Ringboden (8.3) reichende Schlitze (13) angebracht sind und wobei die besagten Schlitze (13) unregelmäßig über den Umfang des Rings (8) verteilt sind, so dass sie eine Vielzahl von Schenkeln mit unterschiedlicher Schenkellänge (L) bilden.
  12. Ein einstückiger Kolben nach Anspruch 11, wobei das Filmgelenk (12) in einem Bereich zwischen den Schlitzen (13) angebracht ist.
  13. Ein einstückiger Kolben nach Anspruch 11, wobei die Schlitze (13) eine Breite zwischen 2 mm und 3 mm aufweisen und die Schenkellängen (L) zwischen den Schlitzen 15 mm bis 20 mm betragen.
  14. Ein einstückiger Kolben nach Anspruch 8, wobei die erste radiale Unterteilung des Kühlkanals mit ihrer Öffnungsweite einen Kühlöleinlass (16) oder einen Kühlölauslass (17) für den Kühlkanal (6) bildet.
  15. Ein einstückiger Kolben nach Anspruch 8, wobei der U-förmige Ring (8) aus Polyphenylen-Sulfid (PPS) oder aus einem Polyimid (PI) besteht.
EP04765810A 2003-10-06 2004-10-05 Kühlkanalabdeckung für einen einstückigen kolben eines verbrennungsmotors Expired - Lifetime EP1685320B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/679,588 US6920860B2 (en) 2003-10-06 2003-10-06 Cooling channel cover for a one-piece piston of an internal combustion engine
PCT/EP2004/011089 WO2005040584A1 (en) 2003-10-06 2004-10-05 Cooling channel cover for a one-piece piston of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1685320A1 EP1685320A1 (de) 2006-08-02
EP1685320B1 true EP1685320B1 (de) 2008-02-13

Family

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Application Number Title Priority Date Filing Date
EP04765810A Expired - Lifetime EP1685320B1 (de) 2003-10-06 2004-10-05 Kühlkanalabdeckung für einen einstückigen kolben eines verbrennungsmotors

Country Status (9)

Country Link
US (1) US6920860B2 (de)
EP (1) EP1685320B1 (de)
JP (1) JP2007507650A (de)
KR (1) KR20070020179A (de)
CN (1) CN100476186C (de)
BR (1) BRPI0415221A (de)
DE (1) DE602004011811T2 (de)
ES (1) ES2302023T3 (de)
WO (1) WO2005040584A1 (de)

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US7406941B2 (en) 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
US7162990B1 (en) * 2005-12-29 2007-01-16 Mahle Technology, Inc. Two-part piston for an internal combustion engine
US20080271597A1 (en) * 2006-03-31 2008-11-06 Soul David F Methods and apparatus for operating an internal combustion engine
DE102007050213A1 (de) * 2007-10-20 2009-04-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
US8347842B2 (en) * 2008-02-19 2013-01-08 Federal-Mogul Corporation Coolable piston for internal combustion engine
US7762227B2 (en) * 2008-02-19 2010-07-27 Federal Mogul Corporation Coolable piston for internal combustion engine
US8517248B2 (en) 2009-10-14 2013-08-27 Ariel Andre Waitzman Mould with conformal cooling
US8739755B2 (en) * 2011-10-24 2014-06-03 Mahle International Gmbh Piston for an internal combustion engine
DE102014015947A1 (de) * 2014-10-30 2016-05-19 Mahle International Gmbh Kühlkanalabdeckung sowie mit einer Kühlkanalabdeckung versehener Kolben
DE102016224280A1 (de) * 2016-06-02 2017-12-07 Mahle International Gmbh Kolben einer Brennkraftmaschine
US11326549B2 (en) * 2020-01-21 2022-05-10 Ford Global Technologies, Llc 218-0266 volcano-shaped inlet of piston oil-cooling gallery
US11946434B1 (en) 2023-02-08 2024-04-02 Innio Jenbacher Gmbh & Co Og System and method for enclosing piston cooling gallery

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Also Published As

Publication number Publication date
EP1685320A1 (de) 2006-08-02
JP2007507650A (ja) 2007-03-29
KR20070020179A (ko) 2007-02-20
DE602004011811T2 (de) 2009-02-12
WO2005040584A1 (en) 2005-05-06
ES2302023T3 (es) 2008-07-01
CN1863997A (zh) 2006-11-15
CN100476186C (zh) 2009-04-08
DE602004011811D1 (de) 2008-03-27
US20050072386A1 (en) 2005-04-07
BRPI0415221A (pt) 2006-12-05
US6920860B2 (en) 2005-07-26

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